12. How think you? if a man have an hundred sheep, and one of them be gone astray, does he not leave the ninety and nine, and go into the mountains, and seek that which is gone astray?
13 And if so be that he find it, I say to you, he rejoices more of that sheep, than of the ninety and nine which went not astray.
14. Even so it is not the will of your Father which is in heaven, that one of these little ones should perish.
CHRYS; He gives yet another reason weightier than the forgoing, why the little ones are not to be despised, For the Son of Man is come to save that which was lost.
REMIG; As much as to say, Despise not little ones, for I also for men condescended to become man. By that which was lost, understand the human race; for all the elements have kept their place, but man was lost, because he has broken his ordained place.
CHRYS; And to this reasoning He adds a parable, in which He sets forth the Father as seeking the salvation of men, and saying, What think you, if a man have a hundred sheep.
GREG; This refers to the Creator of man Himself; for a hundred is a perfect number, and He had a hundred sheep when He created the substance of Angels and men.
HILARY; But by the one sheep is to be understood one man, and under this one man is comprehended the whole human race. He that seeks man is Christ, and the ninety and nine are the host of the heavenly glory which He left.
GREG; The Evangelist says they were left on the mountains, to signify that the sheep which were not lost abode on high.
BEDE; The Lord found the sheep when He restored man, and over that sheep that is found there is more joy in heaven than over the ninety and nine, because there is a greater matter for thanksgiving to God in the restoration of man than in the creation of the Angels. Wonderfully are the Angels made, but more wonderfully man restored.
RABAN; Note, that nine wants only one to make it ten, and ninety and nine the same to be a hundred. Thus members which want one only to be perfect, may be larger or smaller, but yet the unit remaining invariable, when it is added makes the rest perfect. And that the number of sheep might be made up perfect in heaven, lost man was sought on earth.
JEROME; Others think that by the ninety and nine sheep are understood the number of the righteous, and by the one sheep the sinners, according to that said in another place, I am not come to call the righteous but sinners to repentance.
GREG; We must consider whence it is that the Lord declares that' He has joy rather over the converted sinners, than over the righteous that stand. Because these last are often slothful and slack to practice the greater good works, as being very secure within themselves, for that they have committed none of the heavier sins. While on the other hand those who have their wicked deeds to remember, do often through the compunction of sorrow glow with the more heat in their love of God, and when they think how they have strayed from Him, they replace their former losses by gains following.
So the general in a battle loves best that soldier who turns in his flight and courageously presses the enemy, than him who never turned his back, yet et never did any valorous deed. Yet there be some righteous over whom is joy so great, that no penitent can be preferred before them, those, who though not conscious to themselves of sins, yet reject things lawful, end humble themselves in all things. How great is the joy when the righteous mourns, and humbles himself, if there be joy when the unrighteous condemns himself wherein he has done amiss?
BEDE; Or; By the ninety-nine sheep, which He left on the mountains, are signified the proud to whom a unit is still wanting for perfection. When then He has found the sinner, He rejoices over him, that is, He makes his own to rejoice over him, rather than over the false righteous.
JEROME; What follows, Even so it is not the will &c. is to be referred to what was said above, Take heed that you despise not one of these little ones; and so He shows that this parable was set forth to enforce that same saying. Also in saying, It is not the will of my Father which is in heaven that one of these little ones should perish, He shows that so oft as one of these little ones does perish, it is not by the Father's will that it perishes.
Catena Aurea Matthew 18